A Step chart is a form of a XY Plot chart. Step charts are often used when Y values change by discreet amounts, at specific values of X with a sudden change of value.

A simple, everyday example would be a plot of a checkbook balance with time. As each deposit is made, and each check is written, the balance (Y value) of the check register changes suddenly, rather than gradually, as time passes (X value). During the time that no deposits are made, or checks written, the balance (Y value) remains constant as time passes.

Similar to Line and XY plots, the appearance of the step chart can be customized by using the Connection and Symbol properties for each series by changing colors, symbol size, and line thickness.

Symbols can be removed entirely to emphasize the relationship between points or included to indicate actual data values. If data holes are present, the step chart behaves as expected, with series lines demonstrating known information up to the X value of the data hole. Symbols and lines resume once non-hole data is again encountered.

As with most XY style plots, step charts can be stacked when appropriate.

The following image represents the Step chart when you set ChartType property to Step.

The following image represents the Area Step chart with symbols when you set ChartType property to StepArea.

The following image represents the Symbols Step chart when you set ChartType property to StepSymbols.